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Proceedings Paper

Thermal and contamination control of the mid-infrared instrument for JWST
Author(s): Samantha Heys; Bruce Swinyard; Marc Ferlet; Paul Eccleston; Blair Edwards; Melora Larson; Jose Rodriguez; Stuart Glazer; Shaun Thomson; Larissa Graziani
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Paper Abstract

The Mid-Infrared Instrument (MIRI) is the coldest and longest wavelength (5-28 micron) science instrument on-board the James Webb Space Telescope observatory and provides imaging, coronography and high and low resolution spectroscopy. The MIRI thermal design is driven by a requirement to cool the detectors to a temperature below 7.1 Kelvin. The MIRI Optics Module (OM) is accommodated within the JWST Integrated Science Instrument Module (ISIM) which is passively cooled to between 32 and 40 K. Thermal isolation between the OM and the ISIM is therefore required, with active cooling of the OM provided by a dedicated cryostat, the MIRI Dewar. Heat transfer to the Dewar must be minimised to achieve the five year mission life with an acceptable system mass. Stringent cleanliness levels are necessary in order to maintain the optical throughput and the performance of thermal control surfaces. The ISIM (and MIRI OM) is launched warm, therefore care must be taken during the on-orbit cooldown phase, when outgassing of water and other contaminants is anticipated from composite structures within the ISIM. Given the strong link between surface temperature and contamination levels, it is essential that the MIRI thermal and contamination control philosophies are developed concurrently.

Paper Details

Date Published: 16 September 2004
PDF: 12 pages
Proc. SPIE 5497, Modeling and Systems Engineering for Astronomy, (16 September 2004); doi: 10.1117/12.551556
Show Author Affiliations
Samantha Heys, Rutherford Appleton Lab. (United Kingdom)
Bruce Swinyard, Rutherford Appleton Lab. (United Kingdom)
Marc Ferlet, Rutherford Appleton Lab. (United Kingdom)
Paul Eccleston, Rutherford Appleton Lab. (United Kingdom)
Blair Edwards, Rutherford Appleton Lab. (United Kingdom)
Melora Larson, Jet Propulsion Lab. (United States)
Jose Rodriguez, Jet Propulsion Lab. (United States)
Stuart Glazer, NASA Goddard Space Flight Ctr. (United States)
Shaun Thomson, NASA Goddard Space Flight Ctr. (United States)
Larissa Graziani, Swales Aerospace (United States)

Published in SPIE Proceedings Vol. 5497:
Modeling and Systems Engineering for Astronomy
Simon C. Craig; Martin J. Cullum, Editor(s)

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